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  #11  
Old 09-14-2016, 05:49 AM
vic syracuse vic syracuse is offline
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It is interesting with all of the conflicting data regarding the impulse mags on some of the engines we use on the RV-10. The gentleman (Joe) in the Slick booth at OSH was quite outspoken that they need to come off due to the potential for a catastrophic failure. However, some of the engine shops were not so adamant. Not knowing who to believe, and not wanting to be the one to find out, I replaced the 6351 impulse mag on my IO-540 with a 6350 straight mag, and now start only on the Lightspeed electronic ignition. I've actually not noticed any difference in starting.
If you have switches on the ignition it is easy to do this---just enable one ignition for starting. And don't forget to turn the other ignition on after starting! If you have a key switch, don't forget to install a jumper on the key switch to disable the non-impulse mag for starting, otherwise you will get a kickback, especially if you are using the Lithium batteries which spin the starter quite rapidly.

Vic
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  #12  
Old 09-14-2016, 06:14 AM
N427EF N427EF is offline
 
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I am thinking of replacing the Slick mag with one of these.
http://www.surefly.net/
I would like to see a few more field reports before I go down the surefly road.

Vic's idea is also being considered especially since I have toggle switches installed for my one Slick and one LSE ignition.
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  #13  
Old 09-14-2016, 06:26 AM
togaflyer togaflyer is offline
 
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More info after the engine shop spoke to the Lycoming people. When a three blade prop is hung on this engine series, the harmonics change at the rear of the engine. This causes an unusual wear on the mag parts, which can eventually cause a failure with the rivet in the impulse assembly. Some issues have also occurred with the mag due to engine mods. My engine guy said he has not personally came across the mag failure issue, but has heard about it from other shops. I agree with Vic, there is nothing wrong with the Slick non-impulse mags, I went with the Bendix impulse mags vs the Slick Start unit. Its all about what you want to start the engine. Once the engine is running, a mag is a mag. As Vic said, I don't want to be the one to find out. Under Murphy's Law, I would be the one to have a castitrophic failure with the Slick impulse mag set up.

P.S. No expertise in this area, just passing on the info I was told.
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  #14  
Old 09-14-2016, 06:50 AM
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Auburntsts Auburntsts is offline
 
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Default Approved Slick Models

For future reference for anyone that does a thread search on this topic, IAW with Lycoming SI 1443K, the only approved Slick mags for an IO-540-C4B5 or D4A5 (the 2 most prevalent 540 models on RV-10s) are the 6393 retard breaker mag on the left, and the 6350 plain mag on the right.

http://www.lycoming.com/Portals/0/te...20Magnetos.pdf
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  #15  
Old 09-14-2016, 07:52 AM
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Weasel Weasel is offline
 
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Been running a NON-Impulse S-20 on the right side location along with a Lightspeed ignition.

The ignition is configured to use the Lightspeed for starting then bring the Bendix online after running.

Works good now for over 1000 hrs with no impulse coupler to fail.
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  #16  
Old 09-14-2016, 08:37 AM
vic syracuse vic syracuse is offline
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Quote:
Originally Posted by Auburntsts View Post
For future reference for anyone that does a thread search on this topic, IAW with Lycoming SI 1443K, the only approved Slick mags for an IO-540-C4B5 or D4A5 (the 2 most prevalent 540 models on RV-10s) are the 6393 retard breaker mag on the left, and the 6350 plain mag on the right.

http://www.lycoming.com/Portals/0/te...20Magnetos.pdf
Good reference. The date is 2015. Most of the RV's have been built prior to this SI and the engine shops made it a practice to put an impulse mag on the left. I did check mine every 250 hours, and even replaced it at 800 hours just for piece of mind, before I finally removed it and installed the 6350 since OSH 2016. And though it probably shouldn't matter, I did remove the impulse mag from the left side and installed the 6350 on the right side.

Vic

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  #17  
Old 09-14-2016, 11:05 AM
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Auburntsts Auburntsts is offline
 
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Quote:
Originally Posted by vic syracuse View Post
Good reference. The date is 2015. Most of the RV's have been built prior to this SI and the engine shops made it a practice to put an impulse mag on the left. I did check mine every 250 hours, and even replaced it at 800 hours just for piece of mind, before I finally removed it and installed the 6350 since OSH 2016. And though it probably shouldn't matter, I did remove the impulse mag from the left side and installed the 6350 on the right side.

Vic

Vic
Yeah but it is version "K". I did an quick internet search and was able to find version H dated Feb 7, 2012 and the approved Slick mags are the same.
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  #18  
Old 09-14-2016, 11:20 AM
AviatorJ AviatorJ is offline
 
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Quote:
Originally Posted by AttackPilot64 View Post
Do yourself a Favor and go with the EMAG PMAG electronic ignition. I can promise you, you will not be disappointed.
Only thing I'm disappointed about is I'll probably be flying by the time these come to market.
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  #19  
Old 09-14-2016, 11:32 AM
togaflyer togaflyer is offline
 
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More info after the engine shop spoke to the Lycoming people. When a three blade prop is hung on this engine series, the harmonics change at the rear of the engine. This causes an unusual wear on the mag parts, which can eventually cause a failure with the rivet in the impulse assembly. Some issues have also occurred with the mag due to engine mods. My engine guy said he has not personally came across the mag failure issue, but has heard about it from other shops. I agree with Vic, there is nothing wrong with the Slick non-impulse mags, I went with the Bendix impulse mags vs the Slick Start unit. Its all about what you want to start the engine. Once the engine is running, a mag is a mag. As Vic said, I don't want to be the one to find out. Under Murphy's Law, I would be the one to have a castitrophic failure with the Slick impulse mag set up.

P.S. No expertise in this area, just passing on the info I was told.
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  #20  
Old 09-16-2016, 08:25 PM
Kellym Kellym is offline
 
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Quote:
Originally Posted by BobTurner View Post
I have the standard Slicks (retard, no impulse coupling) and have been to 17,900', LOP, no issues. (Plane would go higher but I dislike O2 masks).

I think the better high altitude performance doesn't show up until you're higher up in the flight levels, and/or have worn plugs.
See what performance you have at 700 hours on your mags. Slicks don't generally do well after 500 hours, and by 1000 hours need so many parts that you can do better with new. Bendix are more durable and can cost effectively overhaul indefinitely. The S1200 mag is far more resistant to crossfire than any Slick will ever be.
The only reason Lycoming switched to Slick is that they are owned by Textron, and Bendix is owned by Teledyne and they weren't going to buy from their corporate competitor. Same reason Cessna switched from Continental engines to Lycoming.
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